I started having a strong sensitivity toward very hot food or beverages on tooth number 30 a molar in the back. I had already had a filling there so the doctor thought that I would either need a root canal, or maybe I just need to replace the filling (he said because the silver filling had shrunk and left a little gap). So we opted to replace the filling. The original cavity was very deep, so he wanted to put in a temporary for a month or so. We did that, and the tooth was fine. No sensitivity at all. Then about a month and 1/2 later I went in and had the permanant (ivory colored) filling put in. The original was silver. After the novacain wore off, I was in pain for at least a month, living off of Excedrin. And sensitivity to hot AND cold now. I felt worse off than before. I went back to the dentist and he was worried that if he went back in, the tooth would be permanantly inflammed and would most likely need a root canal. He said to just leave it for awhile. Well- it has been about 2 months since I had the permanant one in, and I can sleep at night, but the sensitivity is pretty high. Is this normal? Should I go see the doctor again and request a root canal?Rik